Some parts of the gallery only unlock depending on what choices you've made. It's impossible to complete it in a single playthrough because of vastly different paths, including a bunch of fetishes that not everyone is up for. As for Natalie, she's around the university stairs.
Also for everyone else, v0.12 contained a few minor bugs, mostly to do with the journal not correctly updating but those are fixed. v0.12.1 is already up.